grirvan
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Friday, November 06, 2020 3:55 PM
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I have my RTX 380 connected with 1 cable that has 2 8-pin connectors and a second cable with 2 8-pin connectors with 1 hanging loose.
Would it be better to connect 3 different cables with 2 8-pin connectors and leave 1 hanging loose on all 3?
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tecmo34
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Re: Best power connection configuration?
Friday, November 06, 2020 4:00 PM
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How you have it connected, it is how I have my RTX 3080 connected with my Corsair HX850.
This was what Corsair recommended, as not all 750W PSU will have the spots for three dedicated PCIe power cables, as an example.
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jankerson
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Re: Best power connection configuration?
Friday, November 06, 2020 4:12 PM
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grirvan
I have my RTX 380 connected with 1 cable that has 2 8-pin connectors and a second cable with 2 8-pin connectors with 1 hanging loose.
Would it be better to connect 3 different cables with 2 8-pin connectors and leave 1 hanging loose on all 3?
Ideally, yes 3 separate cables.
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alexvar1
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Re: Best power connection configuration?
Friday, November 06, 2020 4:13 PM
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I prefer to have three separate cables, It's how I have my 3090 connected now. I have a 1000W PSU
Alexis Vargas 
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jankerson
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Re: Best power connection configuration?
Friday, November 06, 2020 4:14 PM
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tecmo34
How you have it connected, it is how I have my RTX 3080 connected with my Corsair HX850.
This was what Corsair recommended, as not all 750W PSU will have the spots for three dedicated PCIe power cables, as an example.
That's if you didn't have 3 separate cables, the HX 850 does.
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gabolton
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Re: Best power connection configuration?
Friday, November 06, 2020 4:15 PM
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I'm probably wrong but given the choice I'd leave use a cable per power plug and leave the extra connector hanging.
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jankerson
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Re: Best power connection configuration?
Friday, November 06, 2020 4:19 PM
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gabolton
I'm probably wrong but given the choice I'd leave use a cable per power plug and leave the extra connector hanging.
That's actually how you are supposed to do it.
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gabolton
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Re: Best power connection configuration?
Friday, November 06, 2020 4:26 PM
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jankerson
That's actually how you are supposed to do it.
It makes sense. I'm sure the PCIE cables themselves can handle a 300W draw, assuming it's a quality PSU, but given everything I'm seeing about transients killing cards or popping fuses I'd rather have 3x 150W draws on separate cables rather than one cable pulling 300W and another pulling 150W.
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jankerson
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Re: Best power connection configuration?
Friday, November 06, 2020 4:28 PM
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gabolton
jankerson
That's actually how you are supposed to do it.
It makes sense.
I'm sure the PCIE cables themselves can handle a 300W draw, assuming it's a quality PSU, but given everything I'm seeing about transients killing cards or popping fuses I'd rather have 3x 150W draws on separate cables rather than one cable pulling 300W and another pulling 150W.
Yes, if the PSU actually has 3 separate cables there is no reason not to use them. MOST quality PSUs 850W and over have 3X PCIe cables or more.
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sparetimepc
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Re: Best power connection configuration?
Friday, November 06, 2020 4:37 PM
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Yes you should always run separate cable to each gpu plug in on the card for best results.
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